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Definition:

Grout Pigs

A Grout Pig is used in the construction of wells. Once the well has been drilled, a steel casing is inserted into the well. Grout (cement) is used to anchor the casing to the surrounding rock and soil. Grout is pumped into the casing; the grout pig is then driven down the casing, forcing grout up the outside walls of the casing from the bottom, where it is allowed to cure. After curing, the grout pig is removed.